多重网格法在MM5自适应模式中的应用ApplicationofMultigrid.PDFVIP

31 2 V o l. 31 No. 2 2008 4 Journal of N anjing Inst itut e of M et eoro logy A pr . 2008 , , . M M 5 [ J . , 2008, 31( 2) : 242-249. MM5 1, 2 1, 2 1, 2 韩雪 , 沈桐立 , 沈新勇 ( 1. , 2 10044;2. , 100081) : 将多重网格法应用于M M5 中来加速自适应网格的生成, 并用这种方法来模拟2002 年6 月 17 ) 18 日发生在江南 华南的暴雨过程试验表明: 在收敛精度要求高的情况下自适应模式模拟 结果的精度高于均匀网格模式, 且多重网格法有助于提高运算效率 : 多重网格法; 自适应网格; MM 5; 加速迭代收敛 : P 435 : A : 1000- 2022( 2008) 02- 0242- 0 8 Application of Multigrid Method in the Adaptive Mesh Model H A N Xue1, 2 , SH EN T ong- li1, 2 , SH EN Xin-yong 1, 2 ( 1. Jiangsu K ey Laborat ory of M et eorological Dis as ter, N U IST , N anjing 2 10044, China ; 2. Chinese A cademy of M et eor ogical Sciences, CM A , Beijing 100081, Chi na) Abstract: T he mult igrid met hod, one of t he most ef ficient it erat ive alg orit hm now adays , possesses of t he advant ages of f ast convergent speed and high accurat cy . A dapt ive mesh t echnique aim s at im pr oving t he accuracy o f predict ion by arbit rarily densif ying the grids in areas w here t he g radient of quantit ies is large. By u se of t he mut i- nest ed mesh m et hod t o speedup t he sim ulat ion pro cess , a- dapt ive m esh t echnique is developed w ith M M5 model t o simulat e a rainsto rm in sout h o f Y ang t se River fro m 17th t o 18t h J une 2002 . T he result indicat e t hat if t he accurucy r equirement o f conver- g ence is hig h, t he amount of pr ecipit at ion simulat ed by adapt ive m esh m odel approaches t he